A threat intelligence team has just published a report on malware that arrives as an email attachment and remains undetected by most antivirus programs.
A new kind of malware was recently discovered that managed to slip past 56 separate antivirus products before finally getting caught.
According to Unit 42, the malware was first spotted in May 2022, and it was found hidden within a pretty strange file type — ISO, which is a disk image file used to carry the entire contents of an optical disc. The file comes with a malicious payload that Unit 42 believes was created using a tool called Brute Ratel . BRC4 prides itself on being hard to detect, citing the fact that the tool’s authors reverse-engineered antivirus software in order to make the tool even stealthier.
Unit 42 notes that finding this malware is worrying for a number of reasons. For one, there is a high probability that it is linked to APT29. Aside from the reasons listed above, the ISO file was created on the same day as when a new version of BRC4 was made public. This suggests that state-backed cyber attack actors could be timing their attacks to deploy them at the most opportune times. APT29 has also used malicious ISOs in the past, so everything seems to fall in line.
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